A filter will automatically fill out the Measurement Protocol required fields for you from the _ga cookie or create the cookie if it doesn't exist.

setGlobalOptions() and enablePlugin() have no effect on server calls.

If you're using multiple trackers then you should call create().trackerName("My Tracker").go() once at the beginning of each request to create your secondary trackers before calling any analytics methods. All other options sent to create() on the server will be ignored.

If you're setting a custom cookie name on the client then the automatic filter will not work correctly because it assumes that the cookie name is : _ga. Raise an issue on this project if you need to set the cookie name for some reason.